Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 72 for “"Earth metals"”.
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Raman scattering in heavy rare earth metals
… In order to measure the weak Raman signals of metals a single grating monochromator was designed and constructed and added to an existing double grating monochromator to improve the stray light rejection. Polarized Raman Scattering was used to probe vibrational and electronic excitations in Dy, …
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Outer-core emission spectroscopy of the heavy alkaline-earth metals
… core-excited configurations of the alkaline-earth metals calcium, strontium, and barium are presented. The spectra are found to be anomalously broad and red-shifted with regard to XPS core positions. With the help of data from complementary core-level spectroscopies, a model for both the …
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Outer-core emission spectroscopy of the heavy alkaline-earth metals
… core-excited configurations of the alkaline-earth metals calcium, strontium, and barium are presented. The spectra are found to be anomalously broad and red-shifted with regard to XPS core positions. With the help of data from complementary core-level spectroscopies, a model for both the …
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Studies on the higher oxides of the alkali and alkaline earth metals
Dissertation (Ph.D.)--University of Kansas, Chemistry, 1948.
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Coordination polymers of the alkaline earth metals for applications in synthesis and gas storage
… outlines our efforts to synthesize alkaline earth metal</p> <p>coordination complexes that could potentially serve as gas storage and synthetic precursor</p> <p>materials. The properties of these complexes are heavily influenced by factors such as the</p> <p>propensity to aggregate and the …
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Characterization of ferromagnetic saturation at 4.2K of selected bulk rare earth metals for compact high-field superconducting cyclotrons
The saturation magnetization of the rare earth ferromagnetic metals gadolinium and holmium was investigated. Cylindrical samples were placed in a superconducting test magnet and induced magnetic field measured at various applied fields. Data was obtained with Hall sensors mounted at the tips of the …
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Heavy rare earth superlattices: Epitaxial growth, structure, and magnetic properties
Single crystal superlattices of heavy rare earth metals with yttrium have been synthesized by methods of molecular beam epitaxy developed in this thesis research. Studies of the growth behavior of hcp rare earth metals on bcc transition metal (110) and (211) surfaces, using electron and x-ray …
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Rare earth metal separation with new amide functionalised ionic liquids: understanding species and selectivity
Recycling rare-earth metals from end-of-life products such as hard-drive magnets is of critical importance particularly in the face of growing demand for consumer goods and other applications. Liquid-liquid extraction is the preferred method of separation utilising organic extractants owing to …
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Novel magnetic behavior in heavy rare earth superlattices
Structural and magnetic properties of heavy rare earth films and superlattices synthesized by molecular beam epitaxy are investigated. Epitaxial films of rare earth metals, and superlattices of rare earths with Y interlayers, are grown along different hcp orientations using novel techniques …
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An investigation of cation-exchange in aqueous pyridine
… and aqueous pyridine solutions of the alkaline earth metal cations. The ion-exchange phenomena investigated included: swelling, preferential sorption of solvent and selectivity variations with loading, degree of neutralization of the resin, solvent composition and choice of solution phase anion. …
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Recycling of Rare Earth Magnets with Sulfur Based Chemistries and High Temperature Processing
Rare-earth(RE)-iron-boron permanent magnets are among the strongest permanent magnets available and power essential technologies, from wind turbines to hard disk drives. The production of the rare earth metal for these magnets currently involves significant greenhouse gas emissions and other …
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Birch reduction of cinnamic acid
<p>The use of alkali and alkaline earth metals as reducing agents in liquid ammonia solvent for aromatic and conjugated systems has been investigated by chemists at least since the early 1900's, e.g., Lebau and Picon (1). By subsequent additions of a proton source, the system yielded the first …
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Determination of radium-226 in drinking water by alpha spectroscopy
… separating radium from barium and other alkaline earth metals by ion exchange; and electrodepositing radium onto stainless steel disc for radioactivity counting. The procedure requires the using a chemical yield tracer, Ra-223. Two methods for the preparation of Ra-223 from Ac-227 were studied. …
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Magnetic susceptibility and knight shift measurements in aluminum-rare earth alloys
… solvent Knight shift in dilute alloys of rare earth metals in aluminum have been carried out. The susceptibility results give a clear indication that localized moments exist on each impurity except La, Yb, and Lu, and that the coupling between the total spin and The total orbital angular …
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INVESTIGATION OF CHELATING DYE IMPREGNATED RESINS FOR THE ION CHROMATOGRAPHIC DETERMINATION OF TRACE METALS
… resins for the determination of trace metals in various complex matrices is described. The parameters involved in the production of dye impregnated chelating columns have been identified and optimised, A range of chelating dyes have been impregnated successfully into high-performance …
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Growth and magnetoelastic behavior of b-axis-oriented dysprosium
The rare earth metals have the largest known magnetostrictions, so that their magnetic properties and structural properties are strongly coupled. This coupling is ideally suited for investigation with thin films, in which single crystal films of high quality can be prepared on substrates which …
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Evaluating the Leachability of Elements from Residuals Generated by Hydraulic Fracturing in Marcellus Shale
… revealing the increased tendency for alkali metals, alkaline earth metals and halogens to leach. Leachablility was further increased for metals when exposed to acidic conditions.
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Solid state interaction between thin metal films and SiO2 substrate.
… reacted with the S1O2, while none of the other metals reacted even after heating for hours at high temperatures of up to 900° C. These results as well as all the other metal-S1O2 interaction studies that could be found in the literature were summarized and extensively analysed. In all the cases …
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